Wax-form compressor for indirect inlay systems



Feb. 16 1926.,

R. E. TUTHILL WAX FORM COMPRESSOR FOR INDIRECT LNLAY SYSTEMS animatorFiled May 28, 1925 1 work as the wax did not flow sufliciently Qsuflicient space between the surface of the Patented Feb. 16, 1926.

TES PATENT OFFICE.

ROY E. TIJ'TI'IILL, OF BRIDGEPORT, CONNECTICUT.

WAX-FORM COMTRESSOR FOR INDIRECT INLAY SYSTEMS.

Application filed May 28, 1925. Serial No. 33,451.

To all whom it may concern:

7 Be it known that I. Roy E. TUTHILL, a citizen of the United States,residing at Bridgeport, county of Fair-field, State of Connecticut, haveinvented new and useful Wax-Form Compressors for Indirect Inlay Systems,of which the following is a specification. I

This invention relates to a device for making the wax forms used inmaking inlays by the indirect'method. In making inlays by. theindirectmethod, after the cavity in the tooth has been prepared an impression ismade of this cavity and a die or mold is made from this impression,

so that this die, usually of silver, is substantially a reproduction ofthe tooth with the prepared cavity in it. Then this cavity in the die isfilled with inlay wax and the outer orbiting face is carved intheexposed surface ofthewax. After this wax inlay or form has been preparedthe gold inlay is cast using this wax inlay as a form or pattern, andthen thejcast inlay is fastened in the cavity in the tooth by means ofcement. This indirect method is more desirable than the direct methodbecause the greater part of the work in preparing the inlay may beperformed in the laboratory instead of by direct operation on the toothof the patient. Of course, the chief difficulty is in preparing an inlaywhich will exactly fit the cavity in the tooth. Heretofore, diflicultyhas been experienced in making the inlay wax conform properly to thewallsof the cavity in the die. Sometimes the wax was melted into thecavity andsometimes it was merely pressed into the cavity with thefingers, but both [of these methods was unsatisfactory for fine to fitall the uneven surfaces in the cavity and to fill all the recesses. As aresult the cast inlay made from this wax form did 7 ,not fit the cavityin the tooth with the desired accuracy and it was, therefore, diflicultto fasten it'in the cavity. There might .be a clear line between thesurface of the tooth I and the inlay and there might be cavity and theinlay for foreign substances decay and the may be caused to exactly fitall the irregularities of the surface of the cavity in the die, andtherefore, fill all the recesses and give a form or pattern for theinlay which conforms exactly to the surface configuration of the cavityin the tooth, so that the inlay which is cast from this wax form orpattern will exactly fit the surface of the cavity in the tooth,eliminating the objections above noted.

With the foregoing and other objects in view, I have devised theconstruction illustrated in the accompanying drawing forming a part ofthis specification, similar reference characters being employedthroughout the various figures to indicate corresponding elements. Inthis drawing,

Fig. 1 is a side elevation and partial vertical section of a form ofdevice constructed to carry out my invention.

Fig. 2 is a rear elevation of the same looking from the left of Fig. 1.

Fig. 3 is a vertical section through the die block and wax holdershowing how the die is forced into the wax.

Fig. 4 is a similar view illustrating how the die may be removed fromthe holder.

Fig. 5 is a top plan view of the support for the holder.

Fig. 6 is a side elevation view of the wax holder.

Fig. 7 is a side elevation and top plan view of the die block with thedie in position, and

Fig. 8 is a side and front elevation of a die.

In the specific construction shown, which, however, is capable ofconsiderable variation without departing from the spirit of myinvention, there is a base 10 having an opening 11 therethrough, and ifdesired this base may be secured to a table or bench by suitable screwspassing through the opening 12. Extending upwardly from the base is astandard 13 to the upper end of which is pivoted a lever 14 by means ofa pair of links 15. This connection allows the lever to not-only swingin relation to the standard but alsoto have a certain lateral movement.Extending forwardly from the standard is a guide 16 having an openingtherethrough for a plunger 17 and in which opening this plunger isguided forvertical reciprocation. 'lhe plunger is forked at its upperend, as shown at 18, to embrace the lever and to which it is connectedby a transverse pin 19 projecting into slots 9.0 in the sides of thefork. Mounted on thebase isa supportingsnieiriber 21 which has are'rlueedportion 22 extending into the opening 11 and providing ashoulder 28 to rest on the upper surface of the base. "On its uppersurface this support is eu ppediorrecessed,vas shoyvn.

- ed to zreceive and'hold thednlav vntxl2'8 and also a di'e block :29".in which the metal-die 30 is mounted. This die block is made to fitthe ;passager27'inthe holder andito slide therein. :It'isiprovid'edwithe'a reeess '31 in one end to receive :a suitable materia ifor example,modeling compound indicated at 32 which will hold the :die in the"recess.

'llhe device is OperatQdvas afoli'ows After the cavity :in ithe 'toothhas been properly prepared an impression of this acavity made in"-niodel'ing con'ipound as this sent pound wvill iiowvsufliciently :togive zan raccurate 1i mp ressi on of the-surf: :e of the ca-vi ty.,.-I-t is very ('liiiicult fto secure a perfect impression of -this:cavity with inlay XVQDX as this Wax willmot fioW-suiiicientlyto;properly :and *co'mpletely' fill or "conform to 'the irregularitiesand =recesses in the surface-of the cavity under the :pressures whichare available. As indicated above, however, an

accurate impression may .he-made With the I modeling --eompound, :but it:is necessary to make a wax reproduction of this impression in=order tosecure .a mold for casting the inlay. I

After \the impression of the tooth and the cavity therein has heenitakenwiththe modeling compound a .die is made from this impress-ion, usuallyof :silver; and it will be apparent that thisdie is substantially areproductionofthetoothand theprepare il cavity member .21, .as indicatedin Fig. 1.

therein. This is the die indicated at 30 in the drawing,zand 'it issecured in the recess 31 :in -the'end 'o'f-t-he diehlock 29 bymod-elingcompound or other .suitable material 32 aszdescribed. The cavity inth'isdie incheated "at 33 is an exact reproduction --of the cavity inthe tooth. A plugwor hlock of special inlay Wt-X-28 is placed Within theholder 26, this Wax being first; made suffici ently plastic so that itwill flow under pressure as desired, by Warming it fto :theproper'i-temperature, and then the holder is placed Within the :recessin the supporting This support aswill heapparent, closes the lower openend of theholder andthe wax will be confined by the holder and thesupport. The die TblOCk .29 with" the-die -30 is then inserted in theupper'end of the holder-26 With-the die down,.-as'indicated.in .Fig. 1.Theflever ldis-ithen depressed forcing the plunger 17 againsttheaend'ofthedie block and pressing irregularities and recesses in'the surfaceof the-cav1tytinithe die .soitha-t the surface of the Wax Will be anexact duplicate of the surface in .the cavity. After the Wax has cooledthe die block and the wax is re moved fromthea-holder. :Iffor-any'reasmi the Wax-should stick in the. holderlthe supaortin member:21 ma zbe removed :from

the lease and the iholdergplaeed over the opening 11 as indicated in I4. L'It-"WillZlTG apparent tl vat then the-die 'abloc-k rand 'the waxinlay abev easilyforeed 'out the .lowen end of the holder by means ofthe plunger :and the lever. Therefore, the opening 11 in the baseshould-he alargerthan the passage 2'7 :in' the holder. :26 but smallerthan the outside diameter 'of this holder. 1t zis'ito he noted that thepassageway in-ith-e holder is made iintd-ifierent sizes for different:sizes of teeth,-the :outside diameter :remaining the same. 1

0f course, ,the .amou'nt-"of the Wax {placed in the holder is gauged:according to the used so that there will be sufficient =.to -'al-.

10W :forearving ofthe outside-or bitin-gsui face-of the inlay asdesired. .Afterthe-die and the wax plug is removed from the holder-thisexcessiof Wax is earved; by :hand to give 'the desired shapeand 'eontourto the biting :or exposed surface :of 'the inlay. The -inlay form in thedie :is then i exaetly of the shape and size ef the gold -i'nl-a;y whichis to :be (placed inthe tooth rTl'iis wax form .or pattern :is thenI'QIHOVQCl :from the i die and embedded in the :regular :investmentanaterial which sets about this form. This Wax 'is-of such 1 amaterial'ethat When this (mold :i-s .heated the is entirely dissipated liner:absoi bed hy the ::investinent imaterial leaving :a "cavity: in themold whichri-s atmexaet duplicate ofthe inlay to aloe placed in thetooth. l hesgold zin-, liay is then casthyforcing HIOllZQH -gOld lHtOthis cavity with any one of ithescasting ehinesnow on Ytheima'r-ket.

lt .willgbe apparent that because of this device-Lain enabled (to rforeethe inlay Wax into all parts-of the cavity in the die which is an exactduplieateiof the eavity in the continuation :of ithe itooth.

Having thus set forth the nature of my invention, what I claim is:

1. In a device for making Wax forms for inlays, a holder for inlay wax,a block, a separate die having a cavity therein carried by the block,said holder being arranged to confine the wax and guide the block forreciprocatory inovement, and means for foreing the die into the wax tocause the wax to fill all parts of the cavity.

I 2. In'a device for making Wax forms for inlays, a holder for inlay waxcomprising an open ended tube, a support for the tube 7 arranged toclose one end thereof, a block mounted to enter and close the tube atthe opposite end and carry a die having a cavity, and means for exertingpressure on the outer end of the block to press the die into the wax andforce the Wax into all parts of the cavity to fill the same.

3. In a device for making wax forms for inlays, a base, a cupped membermounted on the base, a holder for inlay Wax comprising an open endedtube adapted to seat in said cupped member and be closed thereby a blockcarrying a die having a cavity mounted to slide in said tube and closethe other end thereof, a standard secured to the base, and means carriedby the standard for exerting pressure on the block to press the die intothe Wax and force the wax into the cavity to fill the same.

I. In a device for making wa'x forms for inlays, a base having anopening, a supporting member having a portion extending into saidopening, a holder for inlay wax comprising an open ended tube adapted toseat at one end 011 the supporting member and be closed thereby, a blockmounted to slide in and close said tube and adapted to carry a diehaving a cavity, theopening in the base being greater than the openingin the tube and smaller than the outer diameter of the tube, and meanssecured to the base for exerting pressure on the block to press the dieinto the wax and force the wax into the cavity to fill the same.

5. In a device for making wax forms for inlays, a base, a holder forinlay wax comprising an open ended tube, a support for the tube on thebase arranged to close one end thereof, a block mounted to enter andclose the tube at the opposite end and carry a die having a cavity, anupright standard mounted on the base, a guide on the standard, a plungermounted in said guide and arranged to engage the outer end ot the block,and a lever pivoted to the standard and connected to the plunger toforce the plunger against the block and press the die into the NVilX.

6. In a device for making wax forms for inlays, a base, a holder forinlay wax co1nprising an open ended tube, a support for the tube on thebase having a flange to embraee'one end of the tube, said support beingalso arranged to close the end of the tube, a block mounted to slide inand close the tube from the opposite end and carry a die having acavity, an upright standard mounted on the base, a guide on thestandard, a plun ger mounted in said guide and adapt-ed to engage theend of the block, and a lever pivoted to the standard and connected tothe plunger to force the plunger against the block and press the dieinto the Wax to force the wax into the cavity to fill the same.

7. In a device for making wax forms for inlays, a holder for inlay waxcomprising an open ended tube, means for supporting the tube and closingone end thereof, a block adapted to slide in and close the tube andhaving a recess in one end to hold adhesive material for securing a die,a die mounted in the block by said material and means for exerting apressure on the other end of the block to force the die into the wax.

In testimony whereof I afiix my signature.

ROY E. TUTHILL.

